KIT and gastrointestinal stromal tumor: Patients with GIST who carried KIT exon 11 PVs not including 557/558 deletions or delins showed tumors that most frequently originated in the small bowel (site of origin, small bowel 51.5% vs. stomach 22.8%), most frequently had large primitive tumors (diameter > 5 cm 77.2% vs. diameter ≤ 5 cm 22.8% of patients) and most frequently had a high median mitotic rate (mitosis >5/50 HPF 62.8% vs. mitosis ≤ 5/50 HPF 37.2% of patients).